I'd be interested in the answer to this one. Looking at the picture, I can't even tell which way the device goes (he mentions a groundglass, which must be on the underside). Of equal interest would be knowing what it was used for...

I'm not sure I see how it can allow rear movements/bellows focussing. I didn't pay attention whether the Sekor/Seikosha lenses had helicoids to go with their shutters.

My view (I have no 2x3 holders at this time) is that if a filmholder displaces the GG to the rear, the bellows attached to it serves no purpose with a filmholder attached. Maybe it just keeps side light leaks out of the viewing area? Or maybe it just keeps the glass from banging around.

The viewing 'door' can open 90 or 180 degrees (there are 2 selectable 'doorstop' positions).

A link someone elsewhere referred me to showed this back mounted on another plate which then (optionally, I assume) had a bellows. So there was a rear bellows option. I'm not sure if the Mamiya Press 23 was a bellows RF or a solid body with optional rear bellows.

I just wond a box of 2.25 x 3.25 filmholders on eBay so it appears I can use this back. I might hack a 4x5 Graflok-sized plate to temporarily mount it on my backless 4x5 SG.

On 2005-06-26 21:06, Murray@uptowngallery.org wrote:
A link someone elsewhere referred me to showed this back mounted on another plate which then (optionally, I assume) had a bellows. So there was a rear bellows option. I'm not sure if the Mamiya Press 23 was a bellows RF or a solid body with optional rear bellows.

I just wond a box of 2.25 x 3.25 filmholders on eBay so it appears I can use this back. I might hack a 4x5 Graflok-sized plate to temporarily mount it on my backless 4x5 SG.

Murray

Murray, Mamiya Press cameras through and including the Super 23 had rears that could be extended on four little swinging posts like a Linhof Technika. The Universal Press doesn't have this feature. All of them have solid fronts that accept lenses in focusing helicals.